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Old 26th April 2009, 05:14 PM   #1
IG81 is offline IG81  Canada
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Default Isobaric loading question

Hello,

In a multi-way speaker enclosure with isobaric compound-pair bass drivers, is there a relationship between the distance between the two drivers in the sealed chamber and the crossover frequency to the mid/tweeter?

Something in the like of the crossover should be at a lower frequency than the half-wavelenght frequency determined by the distance between the two bass drivers sounds intuitive to me.

Any opinions on that?

Thanks!

IG
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Old 26th April 2009, 05:22 PM   #2
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The crossover point has afaik no relationship to placement.

The important parameter is the phase/time delay between mid/tweeter and bass.

Active x-overs with the ability to alter those work very well.
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Old 26th April 2009, 06:04 PM   #3
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The crossover frequency being within a half-wavelength of the physical distance between bass and treble is just a general recommendation and is nothing to do with if you are using isobaric drivers or not.
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Old 26th April 2009, 06:36 PM   #4
tinitus is offline tinitus  Europe
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Theoretically there will be phase issues with 2 isobaric woofers
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Old 26th April 2009, 06:41 PM   #5
Mr Evil is offline Mr Evil  United Kingdom
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As the frequency of the sound approaches the distance between the two isobarik drivers, they will no longer be in phase, and will stop working as a pair. So yes, you will want to cross over before that happens. You want to keep the distance between the two drivers as small as possible anyway, to minimize the additional moving mass.
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Old 26th April 2009, 09:46 PM   #6
IG81 is offline IG81  Canada
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Quote:
Originally posted by Mr Evil
As the frequency of the sound approaches the distance between the two isobarik drivers, they will no longer be in phase, and will stop working as a pair. So yes, you will want to cross over before that happens. You want to keep the distance between the two drivers as small as possible anyway, to minimize the additional moving mass.

Thanks for the input everyone!

Mr Evil, you understood my question best and confirmed what I thought, thanks!

IG
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